I brewed a BIAB 2.5 gallon mild last Sunday. I forgot to take out my tun deadspace in brewsmith and ended missing my gravity by 6 points. I had no DME to boost the gravity so I pitched the yeast. I picked up some DME last night at my local shop

Will adding some DME this late in the game work? Fermentation is just about complete.

Hey maggator. Adding DME will initiate an additional primary fermentation phase and bring your gravity closer to what you are looking for. Think of it as almost using a sugar adjunct. There are a few things you will need to take into account though. By adding more malt you will be shifting your malt to bitterness ratio in a manner which will be difficult to calculate due to adding additional wort which has not had any of the hop oils. Also because you are re initiating active fermentation you will need to allow it additional time to run its course.